Spark plug TOYOTA LAND CRUISER 1998 Factory Repair Manual

A19885
1.1 mm
- DIAGNOSTICSENGINE
DI-175
368 Author
: Date
:
2004 LAND CRUISER (RM1071U)
5 Check spark plug and spark of misfiring cylinder.
PREPARATION:
(a) Remove the ignition coil assembly.
(b) Remove the spark plug.
CHECK:
(a) Check the electrode for carbon deposits.
(b) Check the spark plug type (See page IG-1).
(c) Check electrode gap.
OK:
No large carbon deposit present.
Not wet with gasoline or oil.
Electrode gap: 1.0 to 1.3 mm (0.039 to 0.051 in.)
NOTICE:
If adjusting the gap of a new spark plug, bend only ºthe
base / groundº electrode. Do not touch the tip. Never at-
tempt to adjust the gap on a used plug.
PREPARATION:
(a) Install the spark plug to the ignition coil assembly.
(b) Disconnect the injector connector.
(c) Ground spark plug.
CHECK:
Check if spark occurs while engine is being cracked.
CAUTION:
Always disconnect each injector connector.
NOTICE:
Do not crank the engine for more than 2 seconds.
OK:
Spark occurs across electrode gap.
OK Go to step 8.
NG

A19431A19884
DI-176
- DIAGNOSTICSENGINE
369 Author
: Date
:
2004 LAND CRUISER (RM1071U)
6 Change normal spark plug and check spark of misfiring cylinder.
PREPARATION:
(a) Change to the normal spark plug.
(1) Remove the spark plug that may be faulty from the
ignition coil assembly.
(2) Install the spark plug to the ignition coil assembly.
(b) Disconnect the injector connector.
(c) Ground the spark plug.
CHECK:
Check if spark occurs while the engine is being cranked.
CAUTION:
Always disconnect each injector connector.
NOTICE:
Do not crank the engine for more than 2 seconds.
OK:
Spark jumps across electrode gap.
OK Replace spark plug.
NG

A21429
ECM
No.1 Ignition Coil with Igniter
No. 2 Ignition
Coil with Igniter Crankshaft
Position
Sensor
Camshaft
Position
Sensor
Other Sensors:
No. 3 Ignition
Coil with Igniter
No. 4 Ignition
Coil with Igniter
No. 5 Ignition
Coil with Igniter
No. 6 Ignition
Coil with Igniter
No. 7 Ignition
Coil with Igniter
No. 8 Ignition
Coil with Igniter
TA C
To TachometerFrom Battery
Igniter
Ignition CoilSpark Plug
No. 1 Cylinder
No. 4 Cylinder
No. 5 Cylinder
No. 6 Cylinder No. 2 Cylinder
No. 3 Cylinder
No. 7 Cylinder
No. 8 Cylinder IGT1
IGF1
IGT2
IGF2
IGT3
IGT4
IGT5
IGT6
IGT7
IGT8 (Engine Coolant Temp.
Sensor, Mass Air Flow
Sensor, Throttle Position
Sensor, etc.)
- DIAGNOSTICSENGINE
DI-203
396 Author
: Date
:
2004 LAND CRUISER (RM1071U)
CIRCUIT DESCRIPTION
These DTCs indicate a malfunction related to primary circuit.
The DIS is a 1-cylinder ignition system which ignites one cylinder with one ignition coil. In the 1-cylinder
ignition system, the one spark plug is connected to the end of the secondary winding. High voltage generated
in the secondary winding is applied directly to the spark plug. The spark of the spark plug passes from the
center electrode to the ground electrode.
The ECM determines the ignition timing and outputs the ignition signals (IGTs) for each cylinder. Using the
IGT, the ECM turns on and off the power transistor inside the igniter and this switches on and off the current
to the primary coil. When current to the primary coil is cut off, high-voltage is generated in the secondary
coil and this voltage is applied to the spark plugs to create sparks inside the cylinders. As the ECM cuts the
current to the primary coil, the igniter sends back the ignition confirmation signal (IGF) for each cylinder igni-
tion to the ECM.

- DIAGNOSTICSENGINE
DI-207
400 Author
: Date
:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
HINT:

If DTCs P0351, P0354, P0356 and P0357 are output simultaneously, IGF1 circuit may be open or
short.

If DTCs P0352, P0353, P0355 and P0358 are output simultaneously, IGF2 circuit may be open or
short.

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records
the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can
help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel
ratio was lean or rich, as well as other data from the time when a malfunction occurred.
1 Check spark plug and spark (See page IG-1).
NG Go to step 4.
OK

A19431
A19884
- DIAGNOSTICSENGINE
DI-13
206 Author
: Date
:
7 Check for spark.
PREPARATION:
(a) Disconnect the ignition coil.
(b) Remove the spark plug.
(c) Install the spark plug to the ignition coil.
(d) Disconnect the injector connector.
(e) Ground the spark plug.
CHECK:
Check if spark occurs while the engine is being cranked.
NOTICE:
To prevent excess fuel from being injected from the injec-
tors during this test, don't crank the engine for more than
5 to 10 seconds at a time.
NG Proceed to page IG-1 and continue to trouble-
shoot.
OK
Proceed to problem symptoms table on page
DI-48.

EM0KR-09
A04458
Compression
Gauge
- ENGINE MECHANICALCOMPRESSION
EM-3
1576 Author
: Date
:
2004 LAND CRUISER (RM1071U)
COMPRESSION
INSPECTION
HINT:
If there is a lack of power, excessive oil consumption or poor fuel
economy, measure the compression pressure.
1. WARM UP AND STOP ENGINE
Allow the engine to warm up to the normal operating tempera-
ture.
2. REMOVE SPARK PLUGS
(See page IG-1)
3. CHECK CYLINDER COMPRESSION PRESSURE
(a) Insert a compression gauge into the spark plug hole.
(b) Fully open the throttle.
(c) While cranking the engine, measure the compression
pressure.
HINT:
Always use a fully charged battery to obtain the engine speed
at 250 rpm or more.
(d) Repeat steps (a) to (c) for each cylinder.
NOTICE:
This measurement must be done as quickly as possible.
Compression pressure:
1,324 kPa (13.5 kgf/cm
2, 192 psi) or more
Minimum pressure:
981 kPa (10.0 kgf/cm
2, 142 psi)
Difference between each cylinder:
98 kPa (1.0 kgf/cm
2, 14 psi) or less
(e) If the cylinder compression in one or more cylinders is
lower than the specification, pour a small amount of en-
gine oil into the cylinder through the spark plug hole and
repeat steps (a) to (c) for the cylinders.

If adding oil helps the compression, chances are
that the piston rings and/or cylinder bore are worn
or damage.

If the pressure stays low, a valve may be sticking or
the seating is improper, or there may be leakage
past the gasket.
4. REINSTALL SPARK PLUGS
(See page IG-1)

A05561
RH Cylinder Head CoverSpark Plug
LH Cylinder Head
Cover
Gasket
RH Intake Camshaft
RH Exhaust Camshaft Bearing Cap
Bearing CapOil Feed
Pipe
Camshaft Sub Gear Engine Hanger
Heated Oxygen Sensor
(Bank 1 Sensor 1) Connector
RH Cylinder
Head Gasket Engine Wire Bracket
7.5 (77, 66 in.´lbf)
16 (160,12)
Heated Oxygen Sensor
(Bank 2 Sensor 1)
Connector RH Cylinder Head and
Exhaust Manifold AssemblyCamshaft
Housing
Plug Snap Ring
Wave WasherBearing Cap
Oil Seal
Oil Seal

Non-reusable part
N´m (kgf´cm, ft´lbf) : Specified torque
See page EM-59
1st 32 (326, 24)
2nd Turn 90°
3rd Turn 90°
Semi-Circular
Plug Camshaft Sub GearCamshaft Gear Spring
Spark Plug
Tube Gasket
Gasket
LH Intake
Camshaft
LH Exhaust
Camshaft
Camshaft Gear SpringSnap Ring
Wave Washer
Camshaft Housing Plug
Semi-Circular Plug
Engine Wire
Bracket
Engine
Hanger

LH Cylinder
Head Gasket

O-Ring
Oil Dipstick and Guide
for Engine
LH Cylinder Head and
Exhaust Manifold
Assembly
Engine Wire
Protector
7.5 (77, 66 in.´lbf)
- ENGINE MECHANICALCYLINDER HEAD
EM-33
1606 Author
: Date
:
2004 LAND CRUISER (RM1071U)

A04473
RH Cylinder Head
LH Cylinder HeadA
A
A11159
Painted Mark90°
180°
A02888
A02861
- ENGINE MECHANICALCYLINDER HEAD
EM-61
1634 Author
: Date
:
2004 LAND CRUISER (RM1071U)
NOTICE:
Do not drop the plate washer of the cylinder head bolt into
A area in the illustration. It will fall down to the oil pan
through the cylinder head and the cylinder block.
(d) Mark the front of the cylinder head bolt head with paint.
(e) Retighten the cylinder head bolts by 90° only for the first
time.
(f) Then retighten them by 90° further for the second time.
(g) Check that the painted mark is now at a 180° angle to the
front.
5. INSTALL SPARK PLUGS
6. ASSEMBLE EXHAUST CAMSHAFT
(a) Install the camshaft gear spring, the camshaft sub-gear
and the wave washer.
HINT:
Attach the pins on the gears to the gear spring ends.
(b) Using snap ring pliers, install the snap ring.

EM0L4-08
P08885
Adhesive
15 mm (0.59 in.)
A03212
Protrusion
A05710
SST
A05711
(1)(2)(3)(4)
- ENGINE MECHANICALCYLINDER HEAD
EM-57
1630 Author
: Date
:
2004 LAND CRUISER (RM1071U)
REASSEMBLY
HINT:

Thoroughly clean all parts to be assembled.

Before installing the parts, apply new engine oil to all slid-
ing and rotating surfaces.

Replace all gaskets and oil seals with new ones.
1. INSTALL SPARK PLUG TUBES
HINT:
When using a new cylinder head, the spark plug tubes must be
installed.
(a) Apply adhesive to the end of the spark plug tube.
Adhesive:
Part No. 08833-00070, THREE BOND 1324
or equivalent
(b) Using a wooden block and hammer, tap in a new spark
tube until the protrusion from the camshaft bearing cap
installation surface of the cylinder head becomes 48.4 -
49.6 mm (1.906 - 1.953 in.).
NOTICE:
Avoid tapping a new spark plug tube in too far by measur-
ing the amount of the protrusion as tapping.
2. INSTALL VALVES
(a) Using SST, push in a new oil seal.
SST 09201-41020
(b) Install the valve (1), the spring seat (2), the valve spring
(3),and the spring retainer (4).

A02861
A04471
Oil Seal
A04472
RH Cylinder Head
LH Cylinder HeadFront
19
108
76
5
4
32
1
351082
4697
- ENGINE MECHANICALCYLINDER HEAD
EM-41
1614 Author
: Date
:
2004 LAND CRUISER (RM1071U)
(c) Using snap ring pliers, remove the snap ring.
(d) Remove the wave washer.
(e) Remove the camshaft sub-gear.
(f) Remove the camshaft gear spring.
HINT:
Arrange the camshaft sub-gears and gear spring (RH and LH
sides).
NOTICE:
Be careful not to damage the camshaft timing tube.
23. REMOVE OIL SEAL FROM INTAKE CAMSHAFT
24. REMOVE SPARK PLUGS
25. REMOVE CYLINDER HEAD AND EXHAUST MAN-
IFOLD ASSEMBLIES
(a) Uniformly loosen the 10 cylinder head bolts on one side
of each cylinder head in a little at a time for several times
as in the sequence shown, then do the other side as
shown. Remove the 20 cylinder head bolts and the plate
washers.
NOTICE:

Removing the bolts in incorrect order could cause a
warp or cracks in the cylinder head.